At NBC News Evan Horowitz is worrying about this article at ScienceAlert that IQs are declining in the countries of Western Europe:
People are getting dumber. That’s not a judgment; it’s a global fact. In a host of leading nations, IQ scores have started to decline.
Though there are legitimate questions about the relationship between IQ and intelligence, and broad recognition that success depends as much on other virtues like grit, IQ tests in use throughout the world today really do seem to capture something meaningful and durable. Decades of research have shown that individual IQ scores predict things such as educational achievement and longevity. More broadly, the average IQ score of a country is linked to economic growth and scientific innovation.
Now, some will leap to the conclusion that the reason for the drop is that dumber people are having more children or the very large migration of people from countries with relatively lower average IQs to those with relatively higher average IQs. Those may be factors but they’re not the only factors as this quote from the second link makes clear:
In the new study, the researchers observed IQ drops occurring within actual families, between brothers and sons – meaning the effect likely isn’t due to shifting demographic factors as some have suggested, such as the dysgenic accumulation of disadvantageous genes across areas of society.
Instead, it suggests changes in lifestyle could be what’s behind these lower IQs, perhaps due to the way children are educated, the way they’re brought up, and the things they spend time doing more and less (the types of play they engage in, whether they read books, and so on).
I would like to propose that IQ tests measure specific cognitive skills related to reasoning and perception, those skills are cultivated by reading, and reading as the primary method for acquiring information has been declining in favor of video, graphics, and so on, the modality I have referred to here as “visualcy”. I have made a number of predictions about the likely implications of that and we seem to be realizing all of them.
As to what to do about it I think the changes are likely inevitable and irreversible. We could try dumping the screens and reading books instead but I doubt that’s likely to catch on.